[patch 07/18] s390/syscall: Use enter_from_user_mode_randomize_stack()

Thomas Gleixner <[email protected]> Tue, 07 Jul 2026 21:06:23 +0200

Newsgroups	gmane.linux.ports.riscv,gmane.linux.kernel,gmane.linux.ports.ppc64.devel,gmane.linux.ports.arm.kernel,gmane.linux.ports.alpha,gmane.linux.ports.mips,gmane.linux.ports.parisc,gmane.linux.ports.sh.devel,gmane.linux.uml.devel,gmane.linux.kernel.arc,gmane.linux.ports.hexagon,gmane.linux.ports.sparc,gmane.linux.kernel.cross-arch,gmane.linux.documentation
Message-ID	<[email protected]>

enter_from_user_mode_randomize_stack() replaces enter_from_user_mode() and
the subsequent invocation of add_random_kstack_offset_irqsoff().

As a bonus this avoids the overhead of get/put_cpu_var() in
add_random_kstack_offset().

No functional change.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: [email protected]
---
 arch/s390/kernel/syscall.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/s390/kernel/syscall.c
+++ b/arch/s390/kernel/syscall.c
@@ -97,8 +97,8 @@ void noinstr __do_syscall(struct pt_regs
 {
 	unsigned long nr;
 
-	enter_from_user_mode(regs);
-	add_random_kstack_offset();
+	enter_from_user_mode_randomize_stack(regs);
+
 	regs->psw = get_lowcore()->svc_old_psw;
 	regs->int_code = get_lowcore()->svc_int_code;
 	update_timer_sys();